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Design space exploration for a coarse grain accelerator

Design space exploration for a coarse grain accelerator

引用

2008 Asia and South Pacific Design Automation Conference, ASP-DAC

作者： Mehdipour, Farhad Noori, Hamid Zamani, Morteza Saheb Inoue, Koji Murakami, Kazuaki Research Institute for Information Technology Computing and Communication Center Kyushu University Fukuoka Japan Department of Informatics Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka Japan Department of IT and Computer Engineering Amirkabir University of Technology Tehran Iran

ISBN: (纸本)9781424419227

In the design process of a reconfigurable accelerator employing in an embedded system, multitude parameters may result in remarkable complexity and a large design space. Design space exploration as an alternative to the quantitative approach can be employed to find a right balance between the different design parameters. In this paper, a hybrid approach is introduced to analytically explore the design space for a coarse grain accelerator and determine a wise design point exploiting data extracted from applications, quantitatively. It also provides flexibility for taking into account new design constraints as well as new characteristics of applications. Furthermore, this approach is a methodological approach which reduces the design time and results in a point which satisfies the design goals. ©2008 IEEE.

关键词： Design

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Evaluating a Mobile Emergency Response System

Evaluating a Mobile Emergency Response System

引用

14th International Workshop of Groupware

作者： Sapateiro, Claudio Antunes, Pedro Zurita, Gustavo Vogt, Rodrigo Baloian, Nelson Systems and Informatics Department Superior School of Technology Polytechnic Institute of Setúbal Portugal Department of Informatics Faculty of Sciences University of Lisbon Portugal Management Control and Information Systems Department Business School Universidad de Chile Chile Computer Science Department Engineering School Universidad de Chile Chile

ISBN: (纸本)9783540928300

Existing information systems often lack support to crisis and emergency situations. In such scenarios, the involved actors often engage in ad hoc collaborations necessary to understand and respond to the emerging events. We propose a collaboration model and a prototype aiming to improve the consistency and effectiveness of emergent work activities. Our approach defends the requirement to construct shared situation awareness (SA). To support SA, we developed a collaborative artifact named situation matrixes (SM), which relates different situation dimensions (SD) of the crisis/emergency scenario. A method was also developed to construct and evaluate concrete SM and SD. This method was applied in two organizations' IT service desk teams, which often have to deal with emergency situations. The target organizations found our approach very relevant in organizing their response to emergencies.

关键词： Emergency services

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Efficient delivery of MBMS multicast traffic over HSDPA

Efficient delivery of MBMS multicast traffic over HSDPA

引用

IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Evangelos Rekkas Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

Multimedia Broadcast/Multicast Service (MBMS) and High-Speed Downlink Packet Access (HSDPA) are two key technologies that constitute a significant step towards the Mobile Broadband. MBMS was introduced by the third Generation Partnership Project (3GPP) in order to support broadcast and multicast communication over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). Concurrently, HSDPA aims to ensure the transmission of high peak data rates and increase system capacity. In this paper we evaluate the performance of MBMS multicast transmission over the premier transport channel used in HSDPA, named High Speed-Downlink Shared Channel (HS-DSCH). Due to the fact that downlink transmission power is the scarcest resource in UMTS networks, the evaluation is performed through an analytical dimensioning of the MBMS downlink transmission power. Furthermore, the impacts of power allocation on MBMS capacity are investigated.

关键词： Interference Downlink Multiaccess communication Signal to noise ratio Spread spectrum communication 3G mobile communication Throughput

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Emulating lossless, one-way signaling protocols in OBS networks with traffic prediction

Emulating lossless, one-way signaling protocols in OBS netwo...

引用

International Conference on Optical Network Design and Modeling, ONDM

作者： Demetris Monoyios Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, we propose a new scheme for on demand reservation of capacity in OBS networks, emulating one-way signaling protocols. The proposed framework relies on the combination of a two-way reservation protocol and a burst assembly scheme with a burstification delay enforced to be the round-trip-time and which incorporates a Least Mean Square filter to predict burst length. Upon the arrival of the first packet in the burst queue, a control packet (setup message) is generated and transmitted to reserve resources, based on the prediction filter. In this way the reservation process starts/ends simultaneously with the burst assembly process. In this paper, we present the main features of the proposed scheme, evaluate its performance for both homogeneous and non-homogeneous traffic and we further propose an extension with aggressive over-provisioning of resources that can guarantee lossless operation even for extremely cases of bursty traffic.

关键词： Protocols Telecommunication traffic Assembly Optical losses Traffic control Optical buffering Filters computer networks Delay Switches

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Power saving methods for MBMS transmissions in UTRAN

Power saving methods for MBMS transmissions in UTRAN

引用

IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

The demand for wireless multimedia communications thrives in todaypsilas consumer and corporate market. The need to evolve multimedia applications and services is at a critical point given the proliferation and integration of wireless systems. multimedia broadcast multicast services (MBMS) was introduced in third generation partnership project (3GPP) Release 6 in order to more efficiently use network and radio resources for the transmission of multimedia data, both in the core network and most importantly in the air interface of UTRAN (UMTS terrestrial radio access network). However, several obstacles, regarding the high power requirements, should be overcome for the realization of MBMS. The fact that Node Bpsilas transmission power is a limited resource and must be shared among all MBMS users in a cell indicates the need for power control during MBMS transmissions. Several techniques, such as dynamic power setting and macro diversity combining, have been proposed in order to reduce the power requirements of delivering multicast traffic to MBMS users. This paper examines the efficiency of the utilization of these power saving techniques, by presenting simulation results that will reveal the amount of power that is saved.

关键词： Diversity reception Gain Switches Power demand Propagation losses 3G mobile communication Downlink

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Fast Reservation Protocols for Latency Reduction in Optical Burst-Switched Networks Based on Predictions

Fast Reservation Protocols for Latency Reduction in Optical ...

引用

International Conference on Networking (ICN)

作者： Kyriaki Seklou Emmanouel Varvarigos Department of Computer Engineering and Informatics University of Patras and Research Academic Computer Technology Institute Patras Greece

We propose and evaluate fast reservation (FR) protocols for optical burst switched (OBS) networks. The proposed reservation schemes aim at reducing the end-to-end delay of a data burst, by sending the burst header packet (BHP) in the core network before the burst assembly is completed at the ingress node. We use linear prediction filters to estimate the expected length of the burst and the time needed for the burstification process to complete. A BHP packet carrying these estimates is sent before burst completion, in order to reserve bandwidth at each intermediate node for the time interval the burst is expected to pass from that node. Reducing the total time needed for a packet to be transported over an OBS network is important, especially for real-time applications. Reserving bandwidth only for the time interval it is actual going to be used by a burst is important for network utilization efficiency. In the simulations conducted we evaluate the proposed extensions and prove their usefulness.

关键词： Protocols Optical fiber networks Optical packet switching Delay effects Optical filters Assembly Quality of service Bandwidth Propagation delay Circuits

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An adaptive burst assembly scheme for OBS-GRID networks

An adaptive burst assembly scheme for OBS-GRID networks

引用

International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Nikos Korkakakis Kyriakos Vlachos Research Academic Computer Technology Institute and Computer Engineering and Informatics Department University of Patras Patras Greece

This paper addresses the problem of burst assembly in OBS-GRID networks and particularly the TCP throughput maximization problem for large file sizes. For that purpose, a novel adaptive size-based approach is proposed, following some probabilistic methods and considering the effect of the burstification process in the overall transport system. The scheme has been evaluated in a high capacity GRID network. It was found that the proposed scheme results in shorter file transfer times, a significant higher TCP throughout, thus yielding a positive impact at the grid mechanics. The performance of the scheme is compared to that of a timer-based algorithm.

关键词： Assembly Adaptation model Delay Approximation algorithms Optical fiber networks Heuristic algorithms Algorithm design and analysis

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On the use of genetic algorithms for solving the RWA problem employing the maximum quantity of edge disjoint paths

On the use of genetic algorithms for solving the RWA problem...

引用

International Conference on Transparent Optical Networks

作者： Demetris Monoyios Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, the routing and wavelength assignment problem in all optical networks is considered. A solution to the RWA problem is proposed through a Genetic Algorithm (GA) based approach to search for the most suitable set of paths from many possible ones. We use GAs to solve this problem by introducing a new fitness function based on the mean value of occurrence of the common edges between the different genes of a single chromosome. In addition, we further improve performance and particularly execution times by considering the maximum quantity of edge disjoint paths (EDPs) to initialize the population with some indigo chromosomes. These EDPs are pre-computed and inserted in the GA-RWA problem. The proposed approach has been evaluated on the NSF network topology and compared with other similar schemes.

关键词： Biological cells Genetic algorithms Routing Optical fiber networks Integrated optics Gallium Wavelength assignment

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System's Design and Implementation for Easy Creation of Mobile Commerce Systems

System's Design and Implementation for Easy Creation of Mobi...

引用

International Conference on Internet and Web Applications and Services (ICIW)

作者： John Garofalakis Flora Oikonomou Vasilios Stefanis Computer Engineering and Informatics Department University of Patras Greece Academic Computer Technology Institute Patras Greece

Mobile commerce (m-commerce) is a rather new field in the business world. It depends on wireless networks for accessing the Internet from mobile devices and for exchanging data between such devices. Wireless technologies on the one hand evolve rapidly and are met in many different applications. On the other hand a plethora of factors encourage market to make advances towards the m-commerce market. New ideas about m-commerce services and applications find acceptance by the business world and by users. Unfortunately not all users know how to create m-commerce services and applications. Thus a system which can easily create mobile commerce systems can be proved very helpful. In this paper we present a system which can create other m-commerce systems in a user friendly way. The system is meant to be used in the m-commerce market as a mean of developing hotel Websites and mobile sites. It uses a simple form which guides the user to create fully functional websites and mobile sites. We focus on implementation issues and evaluate our system after testing it. Finally, conclusions are extracted and future work is proposed.

关键词： Business Mobile computing IP networks Web and internet services Companies computer networks Consumer electronics Mobile handsets Bandwidth Cellular phones

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Extension and evaluation of JXTA protocols for supporting reliable P2P distributed computing

Extension and evaluation of JXTA protocols for supporting re...

引用

作者： Xhafa, Fatos Barolli, Leonard Fernández, Raul Daradoumis, Thanasis Caballé, Santi Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer Science Multimedia and Telecommunications Open University of Catalonia Barcelona Spain

Purpose: In any distributed application, the communication between the distributed processes/nodes of the distributed systems is essential for both reliability and efficiency matters. The purpose of this paper is to address this issue for distributed applications based on JXTA protocols aiming at extending and evaluating the protocols of the JXTA library for reliable P2P computing. Design/methodology/approach: After a careful examination of the current version of JXTA protocols, the need was observed for improving the original JXTA protocols such as pipe services to ensure reliable communication between nodes of the grid platform and the discovery and presence service to increase the performance of the applications. Using a mixed P2P network based on broker peers and client peers architecture, which served as a basis to extend the JXTA protocols, was the basis of the approach. Findings: The original JXTA protocols are extented/re-implemented to support the development of reliable P2P distributed applications. Practical implications: The proposed approach has been validated in practice by deploying a P2P network using nodes of PlanetLab platform and testing each of the re-implemented protocols using this real P2P network. The extended JXTA protocols can be used to develop reliable P2P distributed applications. Originality/value: Is of value by showing how to improve both efficiency reliability of JXTA protocols and services. © Emerald Group Publishing Limited.

关键词： Wide area networks

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